It means Lilith' cave, "Lilith" in judaism is associated with sexual lust and child human sacrifice. Why is this important?
These terms are used for child human sacrifice and pedophilia. Anyone involved in this things can easily look up his "grotto" to find what he is looking for. Start searching the term now and you are bound to find some creepy results.
https://conspiracies.win/p/12iNisd8yW/before-oprah-winfrey-sold-out/c/
As far as I know according to their myths, she was the first wife, she was working for the devil and is considered evil as she rejected God and worked for Lucifer, she kills the first 2 sons of Eve. She is also considered to be the serpent who initially gets them out of Eden.
According to their myths, the marriages of the first children happened between the sons and daughters of Eve and Lilith. Hence humanity has an evil seed within everyone.
Additionally Kain marries Isis and lives in the land of Nod (Atlantis in the Mediterranean when it was supposed to have been dry) and they beget Seth and many others. The children of Kain are considered more Evil as they continue more inbreeding and debauchery inventing weapons, drugs, alcohol and music and give birth to deformities such as the Nephilim giants who fight against the righteous offspring of Adam's other children.
All according to their myths of course.